RBU

RBU may refer to:
 * RBU (radio station), a longwave time signal
 * RBU-6000 Smerch-2, a 213 mm caliber Soviet anti-submarine rocket launcher
 * Rabindra Bharati University, West Bengal, India
 * Rayat-Bahra University, Punjab, India
 * Rock Band Unplugged, a video game